shot in the dark

shot in the dark idiom
A wild, unsubstantiated guess; also, an attempt that has little chance for success. For example, It was a shot in the dark, but the engineers had a hunch that replacing the valve would make the system work, or You can try looking for your key on the beach, but I think it's a shot in the dark. [Colloquial; late 1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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